package days29.Title21;

import org.junit.Test;

/**
 * @Author fengzihao
 * @Date 2024-05-13 21:13
 */
public class Solution {
    public ListNode mergeTwoLists(ListNode list1, ListNode list2) {
        if (list1==null)
            return list2;
        if (list2==null)
            return list1;
        ListNode result = new ListNode(-1);
        ListNode resultEnd = result;
        while (list1!=null&&list2!=null){
            if (list1.val<list2.val){
                resultEnd.next=list1;
                list1=list1.next;
            }else{
                resultEnd.next=list2;
                list2 = list2.next;
            }
            resultEnd = resultEnd.next;
        }
        if (list1==null)
            resultEnd.next=list2;
        else
            resultEnd.next = list1;
        return result.next;
    }
}
class ListNode {
    int val;
    ListNode next;
    ListNode() {}
    ListNode(int val) { this.val = val; }
    ListNode(int val, ListNode next) { this.val = val; this.next = next; }
}